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Patented May 20, 1919.

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J. C. SHERRY.

STEAM BOILER.

AFPUCATION FILED MAY ms.

1,304,392. Patented May 20,1919.

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UNITED STATES PATENT OFFICE.

JOHN C. SHERRY, F SEATTLE, WASHINGTON, ASSIGNOR TO SHERRY WATER TUBEBOILER 00., OF SEATTLE, WASHINGTON, A CORPORATION OF WASHINGTON.

STEAM-BOILER.

Specification of Letters Patent.

Patented May 20, 1919.

Application filed May 1. 1918. Serial No. 231.790.

1 To all whom it may concern:

nected with the steam drum by means of a front and a rear header, saidheaders being in turn connected by a series of staggered, inclinedheating tubes, and said steam drum being connected with the lowercirculating drums by means of a series of vertically disposedcirculating tubes to permit a return circulation between the steam drumand the lower circulating drums and an upward circulation through theheaders and the heating tubes carried thereby.

Another object of the invention is to connect the lower circulatingdrums with a combination blow and feed drum to permit an evendistribution of the incoming feed water and to permit collection andremoval of sediment whenever desired.

Another object of the invention is to eliminate as much as possible theemployment of stay bolts and bracing members of any nature, and toarrange the vertical circulating tubes on each side of the furnacechamber to increase the heating area exposed to the furnace.

Another object of the invention is to provide a novel means forstaggering and supporting the heating tubes to permit a free upwardcirculation, and to permit an even exposure of said tubes to the heat ofthe furnace. I

Further objects will hereinafter appear.

The invention consists of the parts and the construction and combinationof parts, as hereinafter more fully described and claimed, havingreference tothe accompanying drawin s, in which Figure 1 1s a sideelevation of the boiler partly in section.

Fig. 2 is an end view of same, partly in section.

Referring to the drawings in detail, A indicates a steam drum and 2 and3 a pair of lower circulating drums arranged one at each side of theboiler. Connecting the steam drum with the lower circulating drums 2 and3 in a front header 1 and a rear header 5. The upper end of each headeris directly connected to the lower half of the steam drum, while thelower end of each header is connected to the lower circulating drums, asshown at 6 and 7, respectively.

Forming a connection between the headers is a serles of inclined heatingtubes, nested above each other in two tiers, as inclicated at 8 and 9.The tubes forming the lower set are staggered in relation to each otherand they are also inclined in opposite directions. One row of tubes isconnected at its lower end with the front header, as at 10, while itsupper opposite end is connected with the rear header, as at 11. Thecomplementary set of tubes is connected at its lower end with the rearheader, as at 12, while its upper opposite end is connected, as at 13,with the front header. The respective tubes must necessarily bestaggered, as shown at 1 1-, 15 and 16, to pass each other, and, due

to their inclination, always permit water to freely circulate in anupward direction from the lower circulating drums through the steamdrum.

There are two sets of nested tubes, as previously stated, and they areboth connected with the front and rear headers, respectively, as shown.The two sets of tubes are, of course, exposed directly to the productsof combustion and an even distribution of the products of combustion isobtained by placing a baifle plate 17 between the upper and lower nestedsets of tubes; that is, heat roduced by a fire passing over or supportedy the grate bars shown at 18 will pass in an upward direction betweenthe lower set of tubes 8 toward the rear header. It will then pass in aforward direction, as indicated by the arrows, over the bafile plate 17and between the upper set of tubes 9, being finally permitted to escapethrough short flues or smoke tubes 19 placed in the upper portion of thefront header into the bridging 20 which forms a part of the frontsheeting of the boiler. The bridging or flue is divided at this point sothat it may pass upwardly and around the steam drum, as at 21, directlyinto a stack 22. I

The smoke flues 19' are shown in Figs. 1

and 2 as being staggered in relation to the tubes 9, the respective rowsof smoke flues being shown at 19 while the oppositely inclined rows oftubes 9 are shown at 9 (see Fig. 2). The products of combustion or heatproduced in the furnace chamber pass constantly in an upward directionand the circulation of water between the lower drums and the steam drumis also in an upward direction, thus permitting a free flow of water andsteam between the lower drums and the steam drum. Return circulation issecured by providing two sets of vertically disposed tubes, such asshown at 22. These are arranged on each side of the boiler eX- teriorlyof the longitudinally extending heating tubes 8 and 9.

There is a double row of vertical tubes on each side of the boiler, suchas shown at 22 and 23, the tubes on one side being connected at theirlower ends with the drum 2 and at their upper ends with the steam drumA; the opposite set of vertical tubes being connected with the lowerdrum 3 and at their upper ends with the steam drum A. A free circulationfor returning water is thus maintained on each side of the boiler and anenormous additional heating area is at the same time obtained.

The steam drum may be provided with a series 'of bafiie plates, such asshown at 25 and 26, to direct the returning water to the vertical tubes22 and 23 and a battle drum 27 slotted in its upper side, as at 28, maybe provided for the escape of steam to be utilized through the steamdrum saddle flange 29. The drum is otherwise provided with a front head30 and a rear head 31, a surface blow-01f nozzle 32, and a manhole plate33. The shell of the drum is preferably constructed of two sections 34and 35,. the lower section being heavier, as shown, as it is constantlyexposed to the heat of the furnace chamber.

For the purpose of permitting an even dis tribution of the feed waterdelivered to the boiler and also for the purpose of readily removing mudand sediment whenever desired, a combination feed and blow-oif drum 40has been provided. This drum is positioned crosswise of the boiler andis cone nected with the rear ends of the drums 2 and 3. This drum isprovided with a feed nozzle ll and a blow-oif nozzle 42. This may beopened in the usual manner from time to time when it is desired to blowoff the boiler for the removal of sediment and the like. The feed waterentering the nozzle 41 is divided into two streams as the drum 40 isconnected with the two lower drums 2 and 3. Water entering each of thesedrums passes endwise through the same and is again evenly distributedand divided to the front and rear headers, respectively, thus providingan ideal system of circulating and distributing the feed water deliveredto the boiler.

The boiler as a whole may be inclosed by sheeting, as shown at 50, andheat-insulating material, such as asbestos or the like, may be employedin connection with the same as in standard practice. Any suitable formof furnace may be employed; that is, either coal may be burned or oilburners may be inserted through the front doors 55. As this does notform. any important feature of the present invention more referencethereto is thought 'unnecessary.

By referring to the boiler in general, it can be seen that the only staybolts required are those which connect the front and rear plates of theheaders. These stay bolts, as shown at 56, are staggered between theheating tubes, and as the inclined tubes 8 and 9 connect the front andrear headers, longitudinally extending bolts or bracing of any kind canbe entirely eliminated.

Another feature of advantage is the enormous heating area obtained.First, it will be seen that both the front and rear headers are directlyexposed to the heat of the furnace chamber, as is also the lower half ofthe steam drum; second, an enormous area is obtained by placing thetubes 8 and 9 as shown; and, third, an additional area is obtained byplacing the vertical return circulating tubes on each side of theboiler. Ideal circulation of the water is at the same time obtained andan added steaming capacity and efficiency in proportion to the amount offuel consumed are obtained when compared with other boilers. It,therefore, not only renders itself adaptable for marine use but also forstationary and other purposes.

I wish it understood that the hand-holeplates, such as shown at 60, maybe placed in the front and rear headers in alinement with the tubes 8and 9 to permit cleaning and expanding of said tubes and that the 110materials and finish of the several parts forming the boiler may be suchas the experience and judgment of the manufacturer may dictate.

Having thus described my invention, what 115 I claim and desire tosecure by Letters Patent is- 1. In a steam generating boiler, a centralupper steam drum, a pair of lower circulating drums arranged on oppositesides of and 120 outwardly beyond the outer sides of the upper drum, afront and a rear header, said headers each having the sides of theirupper ends contracted and said ends connected to the bottom of the upperdrum and'having 125 their lower corners connected to the lower drums,inclined heating tubes connected to the headers, and two series ofvertical circulating tubes at each side of the boiler and forming sidesfor the latter, said series be- 130 ing each disposed beyond the heatingtubes and at the sides of the headers and being arranged with one set inadvance of the other and with spaces between the tubes of one set withwhich spaces the tubes of the other set register, the circulating tubeseach having their upper ends curved inwardly to correspond to thecontraction of the header sides and having their lower ends connected tothe lower drums.

2. In a steam generating boiler, a central upper steam drum, a pair oflower circulating drums arranged on opposite sides of the upper drum afront and a rear header, said headers having their upper ends connectedto the upper drum and their lower ends connected to the lower drums,inclined heating tubes connected to the headers, circulating tubesconnected to the upper drum and to Copies of this patent may be obtainedfor five cents each, by addressing the Commissioner of la'tents v therespective lower drums, a bridging disposed over the front face of theupper portion of the front header and extending outwardly from saidfront face of the upper header in spaced relation thereto to form a flueextending over the front face of the front header, and smoke fluespassing through the front and rear faces of the front header andextending into the flue provided by the bridging to enable the productsof combustion to contact with and circulate around the upper steam drum,

In testimony whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

JOHN G. SHERRY. Witnesses:

JOHN H. HERRING, W. W. HEALEY.

Washington, D. G.

